10-day forecast for St. Marys, PA: 46° to 83°, with precipitation expected on 3 days. The table below breaks each day into morning, afternoon, evening and overnight.
82°
Best day: Sunday, August 9
69° · 0.11 in
Worst day: Wednesday, August 12
Tap any day below to see morning, afternoon, evening and overnight.
Mon, 1083° / 63°0.08
Morning66°feels 67°
Afternoon76°feels 76°
Evening75°feels 76°
Overnight63°feels 63°
83 °
St. Marys, Monday, 10 August
Light rain. High 83°, low 63°.
Pressure30.00 inHg
Wind12.8 mph SW
Humidity73%
Visibility6.2 mi
Dew point63°
Tue, 1182° / 61°0.14
Morning62°feels 62°
Afternoon79°feels 79°
Evening66°feels 65°
Overnight66°feels 67°
82 °
St. Marys, Tuesday, 11 August
Rain. High 82°, low 61°.
Pressure29.97 inHg
Wind5.5 mph NW
Humidity87%
Visibility6.2 mi
Dew point64°
Wed, 1269° / 61°0.11
Morning63°feels 62°
Afternoon69°feels 70°
Evening68°feels 69°
Overnight61°feels 60°
69 °
St. Marys, Wednesday, 12 August
Light rain. High 69°, low 61°.
Pressure29.83 inHg
Wind3.7 mph SW
Humidity100%
Visibility—
Dew point64°
Thu, 1374° / 57°0
Morning58°feels 58°
Afternoon72°feels 71°
Evening63°feels 62°
Overnight64°feels 65°
74 °
St. Marys, Thursday, 13 August
Overcast. High 74°, low 57°.
Pressure29.91 inHg
Wind13.8 mph NW
Humidity41%
Visibility6.2 mi
Dew point46°
Fri, 1473° / 50°0
Morning61°feels 59°
Afternoon70°feels 69°
Evening57°feels 56°
Overnight52°feels 51°
73 °
St. Marys, Friday, 14 August
Mostly clear. High 73°, low 50°.
Pressure30.06 inHg
Wind10.4 mph NW
Humidity35%
Visibility—
Dew point42°
Sat, 1569° / 46°0
Morning58°feels 56°
Afternoon67°feels 66°
Evening56°feels 55°
Overnight51°feels 50°
69 °
St. Marys, Saturday, 15 August
Overcast. High 69°, low 46°.
Pressure30.24 inHg
Wind8.8 mph N
Humidity38%
Visibility—
Dew point40°
Sun, 1656° / 47°0.01
Morning53°feels 52°
Afternoon54°feels 53°
Evening56°feels 55°
Overnight55°feels 54°
56 °
St. Marys, Sunday, 16 August
Light rain. High 56°, low 47°.
Pressure30.15 inHg
Wind3.8 mph E
Humidity93%
Visibility—
Dew point51°
Mon, 1775° / 54°0
Morning62°feels 62°
Afternoon73°feels 73°
Evening61°feels 61°
Overnight55°feels 55°
75 °
St. Marys, Monday, 17 August
Light rain. High 75°, low 54°.
Pressure29.94 inHg
Wind8 mph NW
Humidity43%
Visibility—
Dew point49°
Tue, 1878° / 52°0
Morning63°feels 63°
Afternoon76°feels 75°
Evening65°feels 64°
Overnight62°feels 61°
78 °
St. Marys, Tuesday, 18 August
Overcast. High 78°, low 52°.
Pressure29.97 inHg
Wind4.6 mph SW
Humidity40%
Visibility—
Dew point49°
About this forecast
How reliable is a 10-day forecast?
The first 3–5 days are the most reliable, typically within 2–4°. From day six to ten the models show the trend: the direction of change is right more often than the exact numbers.
What does the time-of-day table show?
Temperature in St. Marys, PA around 8am, 2pm, 8pm and 2am each day — handy for planning a walk, a drive or work outdoors.
How is the best day chosen?
We weigh the daytime high against precipitation: a warm, dry day scores highest.